Almot
Explorer III
Joined 16 years ago
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Re: LiFePo voltage sagging
There is some rationale behind charging to 80%, cycle life is longer. Having max available energy is more important for me so I'm going to ignore this. Besides, charging to 100% takes care of cells balancing. OTH in storage, say unused for more than a week or two, I don't see why not discharge it down to 40-60% as per recommendations. Even if it saves me 5% of capacity in several years. Hot storage is the worst: https://www.uschemicalstorage.com/lithium-ion-battery-storage-requirements/1.5KViews0likes5CommentsRe: LiFePo voltage sagging
I don't have access to BMS, sealed unit, don't want to open and wouldn't know what to do if I opened 🙂 The battery is mostly for back-up, there is grid power. I'm trying to find a middle ground btw the popular mantra "Don't keep for long in Absorb, don't float, don't keep it 100% all the time" on the one hand, and the need to keep it near-full in case of blackout on the other hand. Blackouts happen a few times a month. I would like it to stay at 80% and cycle shallow. What I do now is letting it charge on solar + converter, and then shut converter off for the night to reduce floating time. Ideally, I would like to store it unloaded at 50% charge for a longer life but this is unrealistic and I doubt that my life will be much longer than 4000 battery cycles (6 months a year = 180 cycles a year = 22 years).1.5KViews0likes7CommentsLiFePo voltage sagging
120 AH, , nominal 12.8V. 12.95V unloaded, 12.8 under 4-5 A load. According to discharge curve 12.8 is 30% (they measured at much higher 0.5C rate discharge): Lynac 12.8V 120 AH . Quite a bit of sag. Battery is 3 years old. I did bring it to 20% SOC once or twice.1.6KViews0likes12CommentsRe: Mounting a small amplifier under cabinet?
I've been playing all these scenarios in my head, believe it or not. Other than 2 bolts from inside the casing all seem to be a pain, with my modest fabricating skills. Will see if I can open the case. Yes, extreme heat in a closed RV is what I've been worried about, with tapes. Foam and semi-cured things like that adhesive don't like heat. "Out of wood"... like I wrote, I could make some ugly tray 🙂 ... One option seems doable to me is to attach it similarly to my solar panels only upside down. 2 angles back to back make a Z-bracket, bottom of Z support the device, one on the left and one on the right - here I could use a sticky tape. Top of each Z is screwed to the cab like that clamshell that holds my radio now. For solar I used slotted angle profiles, for this device I have 1x1 fiberglass profiles, epoxy would hold the profiles together, but they are red 🙂1.1KViews0likes0CommentsRe: Mounting a small amplifier under cabinet?
Which one you think would hold it more steady, 1/4" double sided tape or same thickness Velcro? I'm not worried about it falling down soon - maybe with time, when the glue deteriorates. But I'm touching the amplifier often, adjusting the volume or flipping the switch on/off, it has no remote. Volume and other controls are small, I don't want it to move/shake under my fingers.1.1KViews0likes3Comments- 1.1KViews0likes0Comments
Mounting a small amplifier under cabinet?
Bought Fosi BT20A , like it so far. To my ear it beats an average home theater receiver, being also very small. The only good place is under cabinet. I am out of ideas how to mount it. I could buy a plastic clamshell similar to one holding my RV radio under the cabinet but this shell is huge, Fosi is tiny, 4" x 1.6" front, 6" deep front to back, weighs 1 lb. It's all metal, no vent holes, does get warm, not hot. Are there any thick double-side adhesive strips to leave a spacing 1/4" or so from the cabinet and hold it without shaking? Eventually I could make an ugly plywood tray and paint it black but maybe there is an easier way?1.2KViews0likes7CommentsRe: Refridge change
As noted, you need to find one that fits in the cabinet. Inverter - unless you mean an inverter fridge - you need to run your 110V fridge with no hookups without having to run a generator. I strongly recommend upgrading your battery to lithium if you are going to stay offgrid for long. With today's prices you can get Li big enough to go for a few days without recharging. Daily consumption of 10 cu.ft refer could be 60-70 AH in addition to your other loads this is a lot when offgrid. IMO solar becomes essential on longer trips. It is easy to just start a generator and run it for hours if you can tolerate noise and fumes and the neighbors don't mind.509Views1like0Comments
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