Morning all … well it is in Uk and Europe anyways …
SO in a van set up — with (AC240) linked to (B210) how can I charge simultaneously using;
1- 535 solar panel
2- charger 1 whilst driving
Simple -
Connect the Charger 1 to the AC240 DC Input port and connect your solar panel to the DC Input port of the B210.
Yes - that’s what I figured BUT Bluetti told me that the B210 and rhe AC240 when they are linked charge and draw energy to and from each other.
Connecting as you suggest means voltage and therefor wattage input from both charger 1 and solar would not be ( or might not be ) the same causing potential damage.
I guess I could disconnect the link cable as I drive but chances are would forget at some point !
Or adjust voltage via the app to match.
The interconnect cable between the power station and the expansion battery, manages the power transfer of charge/discharge between the 2 units.
The AC240 only has one DC input, which you use for car charging (Charger 1) or Solar input. But, not at the same time.
Assume both the AC240 & the B210 are at 50% charge and connected together via the expansion cable. The Charger 1 is connected to the input of the AC240 and a solar panel on the roof of the vehicle is connected to the B210. In a scenario where there is little to no load on either, the C1 will charge the AC240 whilst driving, it’s electronics will manage the C1 input to charge its battery bank. When the AC240 reaches 100%, the Charge 1 will then charge the B210 thru the interconnect. The solar controller of the B210 will also manage the input of the solar panel to charge, if enough output, to its battery bank. The interconnection between the 240 & 210 manages their interaction.
However, my understanding is, that if the 240 is connected to the 210 and both are not at 100%, the B210 will charge the AC240 thru the interconnect. I would then simultaneously charge the B210 via the C1 and if solar is available, plug in to the AC240. (or Vice Versa)
I’ll tag @BLUETTI_CARE in this reply, as they can confirm or refute my above italicised comment.
That’s a great reply .:. And my plan was to C1 into B210 and solar into AC240. Solar panel I have is 535W and I think C1 outputs similar wattage.
However / reading elsewhere rhe voltage might not match from C1 and Solar panel.
I guess we need to find out if this is an issue. ?
I know that AC240 can take 240 AC charge and solar at same time and I have heard / read that B210 can handle multiple inputs … well, 1 of from ac240 and one of from DC …
With engine running and solar I was hoping to achieve some decent wattage ( maybe 600-800 p hour) so a two hour drive would serve well.
Thanks for your input …
You’re welcome. I don’t think voltage difference is an issue. The C1 input to the B210 is controlled to charge the battery via its internal MPPT/DC-DC charger which outputs the correct and regulated charge voltage. The transfer of energy from the B210 to AC240 is via the interface cable, also regulated and demand driven. Then the AC240 has its own and separate MPPT/DC-DC charger which also regulates charge current and voltage to its battery. Both the C1 & Solar are on the input side of those chargers and can vary in voltage, amperage and wattage.
With the Caveat of not exceeding the input voltage at any time i.e. Voc.
The one thing to not forget is; if load is less than charge and both batteries are full, then no charging occurs anyway, other than an occasional ping to check SOC. This is why even on pass thru, SOC can fluctuate from 100% to 99%. It’s why they are called “smart chargers”, lol. 
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I have just had email chat with Bluetti support and they advise there could be voltage issues when charging from 2 DC sources … potentially leading to damage so please advise …
Hi @Mandp, When AC240 is connected to B210 as a combination of main power station and battery pack, the two units will maintain a dynamic balance state. The charging process will gradually balance the power through BMS management. Both will gradually charge to 100%.
It will not first fully charge AC240 and then charge B210, as this will lead to a large SOC difference between the two, which is not conducive to use and management.
Thanks to @Mandp for the professional explanation, which is very helpful.
Hi @Mav, As for the fact that you mentioned having contacted customer service, could you tell us your service ticket number? We guess there may be a misunderstanding. PV charging at the same time is no problem and will not damage the machine.
@BLUETTI_CARE Thankyou for the info, not having an expansion battery, I was not aware of the charge balancing function.
I ask this, out of interest.
My understanding is, that the AC240 can be charged via AC grid and DC at the same time via Solar or Charger 1.
Not only differing voltages but types. Therefore, can this occur at the same time as the B210, is receiving charge from another DC source?
My assumption, right or wrong lol, is that the respective BMSs of the AC240 and B210 would manage their own inputs and as pointed out by you, their connection via the interface cable balances the overall charge between the 2.
Great that you have got involved to help.
Ticket number is Re:[## 400605 ##]
So - please please can you confirm about my set up I am literally about to install it;
1- (AC240) linked / (B210)
2- Solar Panel 535w 11-60V to connect to (AC240) and on 24/7 while van in use
3- DC Charger 1 connected to (B210)
Clearly the ability to be able to charge via Charger 1 and have solar still generate charge during driving means potential of good collection of energy.
(AC240)
- 30amp DC ( RV out) output from AC240 to run fridge, water heater, water pump ( 28Amps ) via separate fused buss bar
- 10amp to supply 2-4 USB sockets around van with inline fuses
(B210) - 10amp output to feed into switched panel with online fuses to operate 4-6 12v lights and max air fan with load under 10amp total
If you could provide an absolute definiafe yes or no on the charging plan that would be awsome