Emerson/Vertiv R48 Rectifier

unkel

Needless to say, you need a DC isolator to connect it. The chance of a dangerous arc at 48V is pretty low too I would have thought. I leave mine connected to battery, will check the draw shortly and report back

on_the_roots

https://www.boards.ie/discussion/comment/123107335#Comment_123107335

From your post I understand it draws current from the battery when the AC side is disconnected?

You would probably look at a 48V DC Contactor controlled by the AC side, to isolate it from the battery when not in use. I wonder if that is something specific to your rectf model or not.

10-10-20

75w of parasitic consumption is enough to need active cooling on the rectifier. I've never heard of it a happening like that being honest, normally most of that loss is blocked by the second-stage diodes.

unkel

I can confirm zero draw (DC) from the battery when the rectifier is not AC powered (smart plug off)

I'd say the one @Blakes77 has is faulty?

TrueBlue1000

Hi

Am I right to say we could

1. use a 32 amp MCB with twin 16 amp industrial sockets to run two of these rectifiers set at 57 volts?
2. Alternatively we could throttle back to 56 volts and use standard 13 amp plugs?

unkel

https://www.boards.ie/discussion/comment/123535807#Comment_123535807

1. yes
2. no. throttling the voltage down won't have any / much impact on the current drawn, you really need a 16A socket / smart plug for this if you want to run it for hours on end. Unless you can specify a rectifier from the seller that draws well under 13A

TrueBlue1000

https://www.boards.ie/discussion/comment/123536055#Comment_123536055

Great, thanks. I found a smart 32A MCB with metering on Aliexpress. Boards won't let me add a link/

JohnySwan

https://www.boards.ie/discussion/comment/123536152#Comment_123536152

That's not an MCB, It's a switch. There's no overcurrent protection with it, you could have an MCB downstream.

TrueBlue1000

My inverter is in a small space with the batteries. Do these rectifiers run hot?

graememk

2 16 amp sockets from a 32 amp MCB isn't the way to do it, as in a fault condition one 16 amp socket could see all the 32 amps of current, melt/ burn and not trip.

Mcbs protect the cables/sockets not devices.

JohnySwan

https://www.boards.ie/discussion/comment/123536171#Comment_123536171

And it certainly won't trip using an Aliexpress switch

TrueBlue1000

https://www.boards.ie/discussion/comment/123536164#Comment_123536164

Yes, you are correct. My apologies. I have removed the link to avoid any confusion. But, Smart MCBS are available on Aliexpress.

https://www.boards.ie/discussion/comment/123536188#Comment_123536188

Noted. Thank you.

championc

https://www.boards.ie/discussion/comment/123536167#Comment_123536167

Not sure about hot. Noise is more the issue !!!

mjatkey

Guys, sorry to hijack the thread, but looking for some advice.

I have a couple of Huawei RG4850 rectifiers that I'm going to use to top the batteries up (2 x WECO and 1 x Seplos) to nearly full during a 3 hour Pinergy EV window on my setups.

What I was wondering is as the balancing on Seplos is not great when you push the cells to high or low volts could I use something like this CAN control config to do the final balance piece, ie stop inverter charging and let the rectifier on its own do the final bit, or is it best to let the one BMS do this.

I have the integration setup in HA and the ESP32/CAN device built and connected to the rectifier which works fine.

They call it soft charging affectively there are 4 different configurable voltage/current stages and an overall timer.

I've not tried it yet but I know there are similar setups for the Emerson rectifiers.

https://github.com/mjpalmowski/CAN-BUS-control-R4875G1-with-ESPHome-and-MQTT/releases

graememk

https://www.boards.ie/discussion/comment/123537914#Comment_123537914

Id be stopping the rectifier and letting the inverter finish it off.

Also running the rectifier runs at a lower voltage than the inverter, once it passes say 56 v the rectifier will be practically stopped, electrically

TrueBlue1000

I'm glad you hijacked the thread LOL. I also have two Weco batteries and want to add a Seplos. My question is, do you have both types on the one inverter? And if so, how did you do that?

TrueBlue1000

https://www.boards.ie/discussion/comment/123537914#Comment_123537914

I'm glad you hijacked the thread LOL. I also have two Weco batteries and want to add a Seplos. My question is, do you have both types on the one inverter? And if so, how did you do that?

mjatkey

https://www.boards.ie/discussion/comment/123538503#Comment_123538503

Thanks graememk.

Yes both types on the same Solis 5K inverter.

I've tried running them with the WECO CAN connected and currently running with Seplos CAN connected, obviously you can't connect the two BMS together although I'm looking at getting a Victron shunt and using HA to control the inverter.

They sort of stay together SOC wise, I have a seperate recifier but don't have it completly set up yet to bring both upto 100% SOC.

I only charge during the EV window (4 hours with Energia), then flog all the surplus back from 8 in the evening until the 2am EV window opens.

JohnySwan

https://www.boards.ie/discussion/comment/123538895#Comment_123538895

Are those heaters on the Weco batteries?

TrueBlue1000

https://www.boards.ie/discussion/comment/123538895#Comment_123538895

I will have identical setup soon. Same inverter and batteries. Also have HA, but not integrated Solis yet.

Seplos will arrive end July and about to order rectifier (thanks to Unkel).

Very new to all this. So watching closely.

10-10-20

https://www.boards.ie/discussion/comment/123538944#Comment_123538944

Yeah, that setup isn't ideal. It effectively created two very small IR heating panels.

championc

@mjatkey Would you not be much better on Pinergy with doing that much exporting ? Maybe you need the rectifier to fill the batteries in 3 hrs rather than needing the 4 hrs

mjatkey

https://www.boards.ie/discussion/comment/123539323#Comment_123539323

Hi championc, yeah once the Energia contract comes to an end I'll most likely switch, just want to make sure all the "bits" are working as they should I know in theory Pinergy works out at approx 30% more gain per Kwh bought and sold.

The heat pads were for a few weeks over winter sub zero temps and the WECO's will only charge at like 20amp below 10 deg Celsius, I had them on very low say 30watts and seemed to do the trick, what would be the issue with using them?

TrueBlue1000

https://www.boards.ie/discussion/comment/123538895#Comment_123538895

I asked Deepseek to analyse your post.

1. Did it get it right especially around future upgrades?
2. I didn't ask for recommendations, but, got them. What do you think?
   
   

Detailed System Analysis: Dual-Battery Setup on Solis 5K Inverter

1. Hardware Configuration

• Inverter: Solis 5K hybrid inverter (supports battery storage but has limitations with multiple BMS communications).
• Battery Systems:
  • Battery 1: WECO battery pack (with proprietary CAN BMS).
  • Battery 2: Seplos battery pack (using Seplos CAN BMS).
• BMS Communication:
  • The Solis inverter can only communicate with one BMS at a time via CAN bus.
  • The user has tested both WECO CAN and Seplos CAN separately but cannot connect both simultaneously (protocol conflict).
  • Currently, the Seplos BMS is connected, meaning the inverter is receiving SOC/voltage data only from the Seplos battery.

2. Battery State of Charge (SOC) Management

• SOC Discrepancy:
  • Seplos BMS reports 86.6% SOC (likely reading its own battery).
  • Solis inverter reports 79% SOC (may be estimating based on voltage or incomplete BMS data).
  • This suggests:
    • The inverter is not correctly interpreting the Seplos BMS data, OR
    • The second battery (WECO) is dragging the total capacity down (if they are connected in parallel without proper balancing).
• Charging Limitations:
  • The user mentions a separate rectifier (likely a standalone charger) to bring both batteries to 100% SOC, indicating that the Solis inverter alone is not fully charging both packs.

3. Current Workarounds & Issues

• Problem: The inverter cannot properly monitor or control both batteries at the same time.
  • If the batteries are connected in parallel, they may charge/discharge unevenly, leading to imbalances.
  • The Solis inverter may be misreading total capacity because it only sees one BMS.
• Temporary Solution:
  • User manually switches between BMS connections (WECO or Seplos) but this is not a long-term fix.
  • The separate rectifier is being set up to force-balance both batteries.

4. Planned Upgrades (Victron Shunt + Home Assistant)

• Victron SmartShunt:
  • Will be installed to independently monitor total battery bank voltage, current, and SOC (bypassing inverter BMS limitations).
  • Acts as a "master monitor" for both batteries, providing accurate combined SOC.
• Home Assistant Integration:
  • Will use automation scripts to:
    • Control charge/discharge based on Victron shunt data.
    • Override Solis inverter settings if needed (e.g., force charging when SOC is too low).
  • Can merge data from both BMS units (if accessible via Bluetooth/RS485) for better tracking.

5. Potential Risks & Recommendations

• Risk: If the two batteries have different chemistries, capacities, or aging levels, parallel connection without a dedicated balancer could lead to:
  • Uneven wear.
  • Overcharging/undercharging one pack.
• Recommendations:
  • Use a battery balancer (e.g., REC Active Balancer) if keeping both packs in parallel.
  • Isolate batteries with diodes or relays if they behave too differently.
  • Confirm Solis firmware supports multi-BMS setups (some inverters allow RS485 + CAN for two BMS types).

Final Summary

• Current Setup: Solis 5K inverter + two different battery packs (WECO & Seplos), but only one BMS can communicate at a time.
• Limitation: Inverter cannot sync both batteries, leading to SOC mismatches and charging inefficiencies.
• Solution in Progress:
  • Victron shunt for accurate combined SOC monitoring.
  • Home Assistant for automated control overriding inverter limits.
  • Separate rectifier for manual balancing.
• Optimal Fix: Either standardize BMS communication or use an external battery manager (like Batrium or REC) for true multi-battery support.

TrueBlue1000

Has anybody else suggestions on how better to use rectifiers in @mjatkey's scenario? Smart changeover, etc. (will be my scenario too soon)

championc

@TrueBlue1000 look at configuring the Solis as though the batteries connected are Lead-acid's. Then there is no communication to the inverter from any BMS, but yet the BMS's will perfectly manage each pack, managing the charge & discharge currents, and protecting from overvoltage etc..

graememk

https://www.boards.ie/discussion/comment/123542799#Comment_123542799

What a load of waffle. Skimmed it but not gonna waste my time on next word guessers.

Pick a battery to do the communication.

Proper full charges (to a voltage not just 100%)

Let the others just handle themselves.

Going voltage only and smart shunt could be a viable option. If looking to build automations in HA.

TrueBlue1000

https://www.boards.ie/discussion/comment/123542839#Comment_123542839

What a load of waffle, 😀. I'm only learning and was guessing at how mjatkey has it installed. I have a much better understanding thanks to the waffle. Especially considering Solis, Weco, Seplos all tell us not to mix.

So, is this correct.

1. Pick a battery to do the communication. - like mjatkey is using Seplos?
2. Proper full charges (to a voltage not just 100%) - with a rectifier?
3. Let the others just handle themselves - like mjatkey is using Weco?

Alternatively, as @championc says, Lead-Acid set-up (with rectifier to force a manual 100% charge)?

Optional:
Add shunt with HA. But, not required for now. (I plan HA for PV forecasting and load-shifting)

graememk

https://www.boards.ie/discussion/comment/123542975#Comment_123542975

It's helping an understanding on wrong information, elements of truth but generally wrong.

Not getting the battery full is because of restriction on charging time not that the inverter can't do it.

What id say is discharge the battery less and give the batteries a chance to fully charge before trying to sort out discrepancies of SoC.

Small example, the rec battery balancer is for individual cells in a pack not between batteries.

I have 3 batteries connected, of different capacities they all hold the same voltage, you can't balance between packs, - there is nothing to balance, they self balance.

3 water tanks, all same height, but variable widths, all connected together, - they will all hold water at the same height(voltage) but the volume of the tank (capacity, ah) of them are all different.

If you have a hose connected to them, the bigger tank will supply more of the water than the others but will all keep the same level. (Pipe size is the same as the copper cable. Bigger pipes(cables ) have less resistance to flow than smaller ones.

Id be using a rectifier not to finish charging but help at the start and letting the inverter finish.

As batteries fill, the charge rate will slow.

championc

While my inverter charges at 57.6v, my rectifier is set for 56v. So once nearly fully, the inverter finishes things.