How NOT to wire your solar power

[@valentino_govoni_official]

i have smaller batteries wired like that on my mini solar system but in a more organized way.

[@Lane-wj4dg]

Battery tester Lancol Micro-500 ,that i use .

[@kingfshervineyard9674]

I have a fluke multi metre but not all that sure on how to test for anything other than volts.

[@technishn]

Check your battery impedance. Replace the weaker battery if needed. Use a 48v battery balancer. Increase solar panels. Additionally only 50% of capacity is usable with lead acid.

[@kingfshervineyard9674]

Hi Thanks for comment. These are Lithium, so they're supposed to be able to go below 50percent. And as ab ove it's not always the same battery that goes flat.

[@technishn]

@kingfshervineyard9674 What's the total battery Ah and volts, and daily power consumption.

[@kingfshervineyard9674]

@@technishn Arg... let me think. I have four batteries at 100ah. 400ah, the inverter pull is about 60watts, the fridge is 1000 watts on compressor start up then 60 watts running, lights all LED I have a washing machine but only use that on sunny days in the mid morning, nothing else significant. But I also have the back up batteries of a 200ah and a 100ah in parallel linked to a different inverter and charge controller so they don't count, but fill in the gaps. I think my main winter problem could be solved with more panels first before i buy batteries. What's your thinking?

[@technishn]

@@kingfshervineyard9674 I run a small system 300Ah of 12v Lithium and 320W of Solar into dual Victrons 75/15 and 1700w inverter in mainly off grid Freezer. Certainly during winter it struggles on extended overcast periods. If your Solar controller can take more Solar input then it's probably the way to go. I run some panels in series to give higher voltage into the MPPT controllers. I also run some panels on opposite side of shed roof to have morning and afternoon sun. Power consumption is around 650w daily summer and 400w winter. With drained batteries have seen in excess of 1200w into batteries in summer days.

[@technishn]

@@kingfshervineyard9674 I thought I replied, but another reply anyway.. Your 4 batteries are in series so still 100Ah at 51.2V nominal voltage or 5120w (5.12kW). The PwMr Charger inverter runs about 50w continously or 1.2kW per day. The fridge may take about 500w (0.5kW) per day, so your drain 1.7 kW per day, other use such as lights, jug, modem, chargers, washing, etc, might take it to an extra 300w average (0.3kW) per day. So about 2kW usage per day. Check your consumption. During winter you may need about 3-4 times that solar to keep it afloat.. One might get 2kW on an array during winter, but 6kW or more during summer. I think there are online solar calculators for solar for where one lives. My small setup has about 5 days battery capacity, but still drops out 2or 3 times during winter with a small solar panel setup.

[@Lane-wj4dg]

I demolish my first set of battery ,coz i get down till 46V...Truck battery 230Ah.I did know, thous use max to 50percent ,but didnt know 48V is empty for them...buuu.I must buy capacity meter from Aliexpress to be sure ,how mutch i demage them in just 2 monts.Yes ,if just 1 Youre battery is very baad,the rest charge just till it max, and inverter see not inaf Volts to work with. Good luck.Ahoj from Morava.

[@kevinroberts781]

Bms sounds like it.

[@Tezza66]

its not within the start up battery voltage. get rid of the bad battery. use the spare that you would normally use with jumper cables

[@kingfshervineyard9674]

Thanks for your reply but it's not always the same battery.

[@kevinroberts781]

I don't care what the wires looks like as long as they are hooked up right. Honestly sounds like 1 bad battery/bms