Charging a battery via AC wall plug

[robbob2112]

That is one of these - 2 post MRBF fuse - 175amp MRBF to the inverter - 20 amp to the MPPT.

https://www.amazon.com/Blue-Sea-Systems-Terminal-Block/dp/B002INJXO6

Technically the MPPT can do 100amps, but I only have panels enough for 9.54 amps. The fuse is for a cut in the wiring verse a problem at the solar. And - I also have a metal combiner box for my 1 string that has a SPD, main breaker, and a 15amp breaker for each string. I can add 4 more strings later.

It is still a work in progress since I just got the all but one part yesterday. Going to string 3 x 335w panels in series for a Voc of 126v and 9.9amps

panels in parallel - voltage the same, current adds.
panels in series - current the same, voltage adds.

My panel Voc is 42v with 9.54amps - I actually have 4 of them, but 1 is hooking to another battery at the other end of the house with its own MPPT. Similar setup but smaller.

 

[FrankK]

That is one of these - 2 post MRBF fuse - 175amp MRBF to the inverter - 20 amp to the MPPT.

https://www.amazon.com/Blue-Sea-Systems-Terminal-Block/dp/B002INJXO6

Technically the MPPT can do 100amps, but I only have panels enough for 9.54 amps. The fuse is for a cut in the wiring verse a problem at the solar. And - I also have a metal combiner box for my 1 string that has a SPD, main breaker, and a 15amp breaker for each string. I can add 4 more strings later.

It is still a work in progress since I just got the all but one part yesterday. Going to string 3 x 335w panels in series for a Voc of 126v and 9.9amps

panels in parallel - voltage the same, current adds.
panels in series - current the same, voltage adds.

My panel Voc is 42v with 9.54amps - I actually have 4 of them, but 1 is hooking to another battery at the other end of the house with its own MPPT. Similar setup but smaller.

As a newbie, with no electrical background, I like diagrams...



I've seen single-post fuses that attach to the battery terminal. Question: can they be stacked? I.e., on the battery, with one cable going to the controller and another going to the inverter?

 

[FrankK]

 

[robbob2112]

oops, can I delete this last post?

just hit report with a request to delete

You can stack them but it is best to avoid it. The reason is your cable to the battery to the inverter will be larger than the cable battery to SCC.

Look at this - two posts so you can size the wire and fuse right to both destinations.

https://www.amazon.com/Blue-Sea-Systems-Terminal-Block/dp/B002INJXO6/

 

[FrankK]

just hit report with a request to delete

You can stack them but it is best to avoid it. The reason is your cable to the battery to the inverter will be larger than the cable battery to SCC.

Look at this - two posts so you can size the wire and fuse right to both destinations.

https://www.amazon.com/Blue-Sea-Systems-Terminal-Block/dp/B002INJXO6/

Ah, thanks, I misunderstood the idea of the two posts

 

[HRTKD]

If I delete post #28 then I'll piss off the old guys (like me) that appreciated the larger version of the image that didn't require clicking on it. Your choice.

 

[FrankK]

If I delete post #28 then I'll piss off the old guys (like me) that appreciated the larger version of the image that didn't require clicking on it. Your choice.

Sure, if it serves a useful purpose, leave it

 

[Supervstech]

View attachment 229319

I would move the inverter positive wire to the same post as the SCC positive. Otherwise the pair of batteries will become out of balance rapidly.

 

[FrankK]

Follow-up:
Decided my hassle with USB, AC outputs and AC charging was too much trouble, so ordered a new inverter with built-in AC and USB sockets.
Also ordered a separate charger. I think this will simplify my set-up significantly. (Will attempt to sell the old inverter/charger.)

This site provides a nice description, and formulas, for fuses:

Size Fuses or Circuit Breakers for a Solar Power System

Adding a fuse is extra protection for your system. It is meant to protect from system over-voltage or damage from a short circuit.

www.renogy.com

 

[HRTKD]

Follow-up:
Decided my hassle with USB, AC outputs and AC charging was too much trouble, so ordered a new inverter with built-in AC and USB sockets.
Also ordered a separate charger. I think this will simplify my set-up significantly. (Will attempt to sell the old inverter/charger.)

This site provides a nice description, and formulas, for fuses:

Size Fuses or Circuit Breakers for a Solar Power System

Adding a fuse is extra protection for your system. It is meant to protect from system over-voltage or damage from a short circuit.

www.renogy.com

At least for folks with an RV, a good quality inverter/charger will simplify the system. One box, fewer cables. No need to keep track of if the charger is on or off.