Which boxes of a photovoltaic installation are affected by condensation?
Every closed box exposed to thermal cycles: the DC box between panels and inverter, the AC box between inverter and switchboard, junction and disconnect boxes. Unlike the inverter, they dissipate almost no heat to dry their internal air — condensation settles in all the more easily.
Why is there water at the bottom of my ABS box even though it is watertight?
The IP rating blocks liquid water from outside, not the vapor in the air sealed inside nor what migrates through the seals over thermal cycles (see our IP-rating guide). When the walls cool at night, vapor condenses and droplets run down to the lowest point: water pools at the bottom of the box. ABS enclosures are more prone to it than metal ones, their thermal behavior widening the wall/air temperature gaps.
Can humidity really start a fire in a photovoltaic box?
Indirectly, yes: humidity corrodes contact points; a corroded connection raises resistance, heats up, and can strike an arc. A share of PV fire incidents remains unexplained after investigation, and internal box humidity is among the plausible contributors. Keeping the box air below its dew point removes one link from that chain.
Which AS-B format for a standard AC/DC box?
Common AC/DC boxes run 30 to 500 L: the reference format is the AS-C ribbon (pre-adhesive 200 × 8 cm band), in a length sized to the volume — a free sizing study is offered. The AS-B sticker (M or L) covers small boxes up to about twenty litres. Fitted at the bottom of the box, on a clean wall, in seconds.
Can an existing fleet be retrofitted during the yearly visit?
Yes — the most common scenario for O&M operators: the sticker is fitted during the annual check, with no tools and no electrical modification. It does not repair existing corrosion, but stops it from worsening and protects the box until the next visit — where compressed air or silica gel only treat the day of the visit.
Does the AS-B sticker affect the electrical compliance of the installation?
No. The SRD material is a passive mesoporous aluminium oxide, chemically inert and electrically neutral: no conductive path, no emissions, no change to the wiring or protection devices. REACH and RoHS confirmed on request.
Can humidity prevention be leveraged with the insurer?
Documented prevention is always a favorable element in an insurance file, in the same way as the fire protection or surge arrester fitted systematically. Some operators include box humidity control in their prevention policy and record it in maintenance reports.
MOQ and packaging for an installer or O&M operator?
The logic is that of an installation consumable: a single reference per format, quantity adjusted to the fleet. Unit sales and small packs through the online shop; volume pricing and dedicated MOQs for fleet deployments — a few tens of euros per installation at fitting time.
