Hi all, I've been lurking for some time. Setting up a system for infrequent visits to a bush property in Victoria, Australia. Power requirements are low: about 14-20Ah per day @ 24v. Mostly lights, some tool charging & music. 2/3 days of autonomy. Unobstructed north-facing roof gaining an average of 1.1 kwhm2 in Winter to 6.6 kwhm2 in Summer.
I did what the usual beginner did - went arse-about and bought the panels first!
Turns out they're not true 24VDC panels, so though I'd originally intended on wiring them in parallel, advice has been to wire them in series to achieve high-enough charging voltage. We want 24VDC storage as there are some longer cable runs required. I thought I'd still be under the 75V max of the Victron 75/15 with them in series anyway (doubling VMPP, not VOC) but it appears I am mistaken, and that you double VOC in series (even if this is the load-free voltage measurement)?
Design layout attached. Would love to hear your input on any aspects of the system at all.
Tom solar-setup-layout.jpg
I did what the usual beginner did - went arse-about and bought the panels first!
Turns out they're not true 24VDC panels, so though I'd originally intended on wiring them in parallel, advice has been to wire them in series to achieve high-enough charging voltage. We want 24VDC storage as there are some longer cable runs required. I thought I'd still be under the 75V max of the Victron 75/15 with them in series anyway (doubling VMPP, not VOC) but it appears I am mistaken, and that you double VOC in series (even if this is the load-free voltage measurement)?
Design layout attached. Would love to hear your input on any aspects of the system at all.
Tom solar-setup-layout.jpg
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