Occasional Use Battery System - Better with Large Ah or Deeper DOD?

[Bozon]

I want to build a small system that can do one load of laundry per week. If it takes days to charge, that's OK.
I am planning a two panel system 160w each.
T

[Bozon]

I want to build a small system that can do one load of laundry per week. If it takes days to charge, that's OK.
I am planning a two panel system 160w each.
The washer and gas dryer are 110v. Assume 1 hour for wash and 1 hour for dry. Assume 1000w peak, 600w running normal for each unit.
How many Pb batteries at 106ah ea and in what configuration to feed 2000w full sine inverter?

[Mike90250]

OK, you have to use a PSW inverter, both appliances use large motors. And you have to oversize to allow for Power factor loss in the motors.

Laundry consumes 2Kwh, counting all losses.

For 33% discharge, would want 6kwh of storage.

A 80ah 12V marine deep cycle battery holds 960wh
a 200ah 6v golf cart battery holds 1200wh - Four of these wired in series gives you a 24V 200ah bank, at 4800wh. That load of laundry would drain them 50%

You could cheap out and get a 300w grid tie panel that could recharge in 10 hours or about 2.5 days, but what's the fun in that. For the same amount of $, you could get two 12V 100w panels and take 5 days to recharge, sulfating the batteries and causing them an early death.

[Bozon]

How many watts of panel would be required to charge without sulfating? Could the pb batts be wired in series?
What is a PSW inverter?

[Bozon]

PS I am in AZ.

[extrafu]

How many watts of panel would be required to charge without sulfating? Could the pb batts be wired in series?
What is a PSW inverter?

Pure Sine Wave

[Bozon]

Ok. I noted that is what was being planned. Didn't recognise the initials.

[Mike90250]

It's tough to nail the exact wattage accurately to prevent battery sulfation. Better to get a little more PV, than to have to buy batteries 2x as often. Depending on your local conditions, 300w of panel would barely be enough in great conditions. A little bit of haze, clouds, fog, shadows, and you are buying batteries again.

[Bozon]

so six golf cart batt @ 200ah 36v 7.2kwh
panels would need to produce a full
recharge in 4 hours- best AZ day
2kwh in 4 hours required
thats a half a kilowatt per hour 500wh
160w panels (see below)
18.6v @ 160w
160w = 18.6

[Mike90250]

so six golf cart batt @ 200ah 36v 7.2kwh
panels would need to produce a full
recharge in 4 hours- best AZ day
2kwh in 4 hours required
thats a half a kilowatt per hour 500wh
160w panels (see below)
18.6v @ 160w
160w = 18.6

Not quite. Panels only harvest 70-80% of nameplate, a bit more when cold, less when hot.
so to harvest 500w per hour, you need 650w of panels. Maybe 800w, since fixed panels will only have optimum aim for about 20 minutes, as sun moves off axis, harvest drops.

[Bozon]

And if we can track the sun how much improvement do we see?
And is it true the your latitude is the angle of your panels?

[Bozon]

160w panels
18.6v @ 160w
160w = 18.6

[Bozon]

Useless
I post 2 paragraphs worth of into and you see only the first 3 lines

[SunEagle]

Useless
I post 2 paragraphs worth of into and you see only the first 3 lines

Sorry. The Anti Spam software is stupid and ruthless when using an iphone.

I am not sure what you are tying to show with your math concerning the 160W panel with I assume an Vmp = 18.6v

[Bozon]

the batteries are in series @ 36v, do we
want the input of the cc to also be 36v,
or can the input v and output v of the cc
be different? In this scenerio how would
we wire the panels?