namesgolden
Solar Enthusiast
so a year ago I decided to build a small (2kw) system for my RV
that turned into me reselling about 200 solar panels to fund a larger system.
in the process we bought land that had grid power already, so I've been able to take my time.
---------------
things I have on hand:
2x mpp lv2424-msd off-grid units and parallel kits for each
24x 250w 60cell santan panels
solaredge autotransformer
3x 24v120ah lifepo4 banks with chargery BMS's and relays on each.
------ info on the AC power wiring ----
I have a main breaker at the meter. I fed that to another grid-only 200a panel in the house.
the grid only panel will feed both of the mpp units, the mpp units will feed a 200a sub panel
the sub panel also feeds the garage, which is fed with 4/0
there are two RV hookups -- a 30a pedestal in the main driveway for guests and a 50a for our motorhome
-------------- goals -------------
wire up both of the mpp lv2424-msd's in parallel for 4+kw of 120vac
wire up autotransformer to provide split phase 240
get and install manual transfer switch for garage power, so it can be ran on the grid if necessary
---------- concerns ---------
my panels have a 38vOC -- the DC wiring run will be fairly long, can the mpp units handle 3s?
how much overpanneling will they tolerate? if I have to do 2s I'll want to do two 2s5p arrays for 2500w on each controller
autotransformer - how much current can I pull from it at 240v on the regular? should I add extra cooling? how is it going to handle resistive electric loads like water heaters and dryers?
------------------------
shoutouts to santan solar, watts247, signature solar, temco and many many other retailers for being awesome.
that turned into me reselling about 200 solar panels to fund a larger system.
in the process we bought land that had grid power already, so I've been able to take my time.
---------------
things I have on hand:
2x mpp lv2424-msd off-grid units and parallel kits for each
24x 250w 60cell santan panels
solaredge autotransformer
3x 24v120ah lifepo4 banks with chargery BMS's and relays on each.
------ info on the AC power wiring ----
I have a main breaker at the meter. I fed that to another grid-only 200a panel in the house.
the grid only panel will feed both of the mpp units, the mpp units will feed a 200a sub panel
the sub panel also feeds the garage, which is fed with 4/0
there are two RV hookups -- a 30a pedestal in the main driveway for guests and a 50a for our motorhome
-------------- goals -------------
wire up both of the mpp lv2424-msd's in parallel for 4+kw of 120vac
wire up autotransformer to provide split phase 240
get and install manual transfer switch for garage power, so it can be ran on the grid if necessary
---------- concerns ---------
my panels have a 38vOC -- the DC wiring run will be fairly long, can the mpp units handle 3s?
how much overpanneling will they tolerate? if I have to do 2s I'll want to do two 2s5p arrays for 2500w on each controller
autotransformer - how much current can I pull from it at 240v on the regular? should I add extra cooling? how is it going to handle resistive electric loads like water heaters and dryers?
------------------------
shoutouts to santan solar, watts247, signature solar, temco and many many other retailers for being awesome.
