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Look up Kirchoff's Laws in Wikipedia .

I see many posts on the difficulty of starting compressor type heat pumps. There is a French Company that has developed an acoustically driven heat pump system, using a high powered speaker in a closed system pumping helium gas at 30 bar. This system can run at any power level up to it's max and...

Helium is contained ~ 30 year life. Helium is now used for cooling large generators in power plants due to its large heat capacity and low viscosity. Helium is used in balloons . Yes it is only available from radioactive decay, but I don't see that coming to an end.

Thanks for your responses. Breakers will be dc. I like the idea to completely isolate the panels in case of a different circuit path. The panels will be 2s 2p for the 12 volt, because of an unadvertised feature of the PowMr that only allows 80 volts open circuit when charging 12 volt systems...

The total current in and out of a node equals zero . nothing to do with resistance.

I have a question about the importance of maintaining a connection between a solar charge controller and the battery it charges. The instructions for my charger say hook up the battery first before the panels, or damage may occur. There are also instructions for fusing the connection between...

Anmbest Constant Current CC CV Buck Converter Module DC 6-40V to 1.2-36V 20A 300W Adjustable Step Down Voltage Regulator Power Supply Module with Short Circuit Protection Function $15 at amazon

13.8 volts is the nominal voltage for automotive battery operated tranceivers. My Icom IC-7300 manual specs the poersupply voltage at 13.8 volts + or - 15 % or 11.73 to 15.87 volts.

So as long as the controller has seen the battery voltage, it would stay at that setting? (12,24,36,48)

I am nervous about having an exposed high current busbar on my new setup. I wonder if anyone can think of a cheap flexible cover that would insulate the busbar and be flameproof?

Please note the maximum input voltage on the PowMr MPPT 30-60A is only 80 volts for a 12 volt battery system, and 105 volts for a 24 volt system.

Read the instruction manual.

I am about to build my first small pv system consisting of 4 100 panels in 2s2p arrangement, a PowMr 60 amp MPPT solar charger, an SOK 12 v 206 Ah battery and an existing modified sine wave inverter to drive hydroponic lights . There will also be a 12volt output for an Icom IC7300 transceiver...

UNI-T UT210E ~$ 60 at Amazon. has 3 current ranges- 2A 20A 100A ac or dc .Resolution on 2amp range is 1 ma.

UNI-T UT210E is a hall effect device - no shunt and portable. very useful for measuring current in solar strings where the individual wires are available as opposed to a pair of wires. It can also be clamped around any of your high current interconnects or to check the accuracy of built in...