Colin

Thanks, issue is at what stage (how much load and how much volt drop) does it become too far a drop in that we need to believe the voltage more than the BMV? Or do should I totally ignore the volt drop as long as it recovers?

Yes the voltage does recover, never tried the hair drier a second time, maybe I should try that too, a load a few times and monitor the voltage

Ok, zeroing voltage did make a difference, thus morning 48.8V and 81% However when wife starts hair drier (1200W) voltage dips to 47.2V I then run the geny for only 5 minutes then off and she was able to run microwave (1200w) for 3 minute and to toaster (1800w) for one slice without dipping below 48V Should I ignore voltage dip and trust BMV?

Please ignore last question Just read manual and did the Zeroing Busy charging fully with the general and ill see if any difference tomorrow

According to Manual, it should auto calibrate when fully charged.Bank iis set to 400AH Please can you elaborate on how to Zero under no load?

I installed Victron BMV702 a few days ago to my batteries (16 x Vision gell AGM 4 strings making 48V), I already installed 4 x battery HA-02 balancers a couple of weeks ago as I was getting hugely varying voltages on the various batteries. The batteries in my opinion are getting tired, only get about 6kVah till 50% charge measured in volts to 48V This morning when voltage had reached 48V, the Victron BMV still said 77.4% SOC? Is this perhaps because it needs a few cycles to accurately measure the batteries state? Or is there an issue?

Sounds like possibly the best solution, maybe not as cost effective as I would like, seeing as I probably need a new battery bank. Does the Axpert 5kW/5kVa work with the 4kW/5kVa (my current one)?

Thanks, and what strings on what inverters?

@ibiza What batteries and inverter / charger do you have in your setup?

Why would it be dangerous? Surely it would jus be an efficiency issue?

Thanks Chris Thus I should have 2 chargers. Can I use the Axpert as one for the one string, then add another from the second string to the same battery bank?

Hi ibza So far pretty good, just made the (huge) mistake of using default settings for AGM batteries which is cutoff voltage of 44V, this I think has damaged my batteries (16 x Vission 105AH AGM). As this was my fault for not enough research on installation, cannot blame anyone. Tried asking battery supplier for advice after noticing low voltages, but they never even bothered to reply to a phone call and 5 emails. Ordered 4 HA02 balancers to see if I can rescue them, but doubt it. If not will probably go for Pylontech

I have two strings of panels with different orientation on one Axpert 5kVa inverter. Will the different orientation be an issue? Also can I install a second MPPT charger on the same battery bank in parallel?