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I think we can say that my original calculations were pretty accurate, apart from missing the 85% efficiency of the inverter (y) Having said that, I could use a voltage of 12.8 as that seems to be the nominal voltage of the 12v battery that I've been looking at: 1300Wh/12.8V/.85 = 119Ah...

That makes perfect sense, thank you Sir :)

I guess I could connect a 12v Lead Acid battery in the first instance and then replace it with the new LIFEPO4 when I can get one (and update the config of the controller of course)?

I've installed and tested the smart switch and all seems well :-) Presumably, once the battery is "full", the MultiPlus will stop trying to charge it or the BMS will stop accepting any more charge?

If I have a 48v battery that quotes it's capacity as 3.5Kwh, can I calculate the (approx) Amp Hours as 3500 watts divided by 48v which gives 72.9 amp hours?

Apparently, it's one of those "smart" machines that varies the run time based on the weight of the load and I'm reliably informed by the lady wife that using a 30deg wash is worse than useless in most cases, so I just go along with what she tells me :) It's just a little project for me to play...

Most UK appliances have a 13A fuse/rating but I've just noticed the line above the Current says "Electrical connection rating (W) = 1850, so maybe the 2200W I've seen includes the "surge"?

Can't argue with you there Sir :)

Thanks for the link Sir :-) Just had a look and their 12v 100ah option isn't available until the end of May, but good to know that they are an option. Are there any reviews that I can look at?

Ah, I thought this could be done without the "hard wiring" from the Cerbo to the Multi i.e. just in the software (seeing as I wouldn't want to change it very often, if at all)......my bad :( I think the "timer switch" is the easier option for now and it should be with me tomorrow sometime, so I...

Appreciate the information Mike, gives me quite a lot to look into, as it seems that there is a bit more choice that I first thought :-)

Thanks for the response sunshine :) I assume that the maximum wattage of 2200 was the "surge" but can't be 100% sure tbh as I was just using one of those plug-in digital devices that shows the maximum and minimum wattage and total Kwh since the last reset, etc. From what you've pointed out I...

I've currently got a couple of 330w (40v 10a) panels connected in series but the battery I'm looking at (LiFEPO4) has a recommended charge current of 20a, which is double what my panels can currently manage (unless I configure them in parallel). Can I safely charge the battery at 10a (via a...

I thought I might be corrected :)

Good point, it's LIFePO4 :)

I'm actually looking at the PylonTech US3000C that says it has a nominal voltage of 48v

If we take the "usable capacity" of 3374.4 Wh and the Nominal voltage of 48v, it has a 70.29 amp hour capacity?

Thanks for the reply, the SCC is a 150/35 but I thought that it could only charge at the maximum of whatever the solar panels provide i.e. 10a in this case :)

Max charge of the battery is 50a

That's what I was afraid someone would say :) but thanks for the confirmation....I'll have to wait until I can source a battery before being able to test the output of my panels :-(

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I'm considering installing a MultiPlus at home to power a dedicated circuit that isn't connected to the "grid" but I know the PV won't be able to fully charge the battery for obvious reasons. I was hoping to be able to connect the MultiPlus AC-In to a normal power outlet (as per any other...

I stand to be corrected, but I don't think you have any choice but to "lose" two of the PVs from each string as you've exceeded the capacity limits of the Inverters :cautious: I guess you could also go 9s to give a total VoC of 452.88 which is only just over the stated 450v of the Inverter? A...

Thanks, I was thinking about building my own battery (having watched Andy from the Off-Grid garage "in sunny, hot Australia") but have decided to go with something ready built like the PylonTech :)

I should have updated this thread a while ago, as I purchased a Roamer 160ah 12v battery and it has been happily running our Washing Machine via a 3000W 12 v Inverter from FCHAO :)

I currently have 3 x 415W panels in series but have a couple of older 330W panels that I wanted to try and add to the existing setup. I was wondering if the configuration in the diagram below would work without causing any damage to the panels, even though the overall output would be reduced?

Seems to be a little confusion :) The battery (SOK 12v 100ah) can take a maximum of 50a charge but the recommended rate is 20a

Thanks Adam, It was one of your YouTube videos that I watched last night, that suggested that I could do this :) Presumably, I'll have to use the wired connection from the Cerbo to the MultiPlus, as per your video and then enable the schedule as per the screenshots? Cheers for now Russell

I've found a UK manufacturer/supplier of 12v batteries that have a 200A discharge rating: https://roamerbatteries.com/shop/p/12v160ah The washing machine is a Hotpoint and I found the attached specification sheet but it doesn't give any idea of the "surge" rating. Cheers for now

Thanks, I was thinking of something like that as an option using a timer switch normally used for immersion heaters or similar :)